メタデータ
| 項目 |
値 |
| Designation |
C/2000 J1 (Ferris) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2000-05-11T07:12:19.716480Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:04Z |
| Obs used |
24 |
| NEO |
- |
| M1 |
14.200 |
| K1 |
10.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2000-05-11.0000000 |
| e |
0.95426363 |
| q (au) |
2.542550 |
| a (au) |
55.591420 |
| i (deg) |
98.794665 |
| Ω (om, deg) |
28.440310 |
| ω (w, deg) |
147.219674 |
| M (ma, deg) |
359.999286 |
等級
散乱 + 全体線形
$$
M_a = (18.720 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
18.720 |
| n |
2.000 |
| gf |
0.998 |
| gb |
-0.872 |
| k |
0.800 |
| δ90 |
10.000 |
| パラメータ |
記号 |
範囲 |
説明 |
| 太陽・地球距離が1 AUのときの絶対等級 |
H0 |
-5 to 20 |
彗星の固有の明るさ |
| 測光スロープパラメータ |
n |
2 to 6 |
太陽距離に対する明るさ変化率 |
| 前方散乱非対称係数 |
gf |
0.8 to 1 |
前方散乱の強さ |
| 後方散乱非対称係数 |
gb |
-1 to -0.5 |
後方散乱の強さ |
| 分配係数 |
k |
0.8 to 1 |
前方/後方散乱の寄与比 |
| ダスト/ガス明るさ比 |
δ90 |
1 to 10 |
ダスト散乱とガス放射の相対寄与 |
参考: EPSC-DPS2025-160
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
03:52:01.05 |
-35:32:07.3 |
HIP 17922 |
26.65 |
| 2026-07-29 12:00 |
03:52:02.27 |
-35:32:34.7 |
HIP 17922 |
27.02 |
| 2026-07-30 00:00 |
03:52:03.46 |
-35:33:02.2 |
HIP 17922 |
27.38 |
| 2026-07-30 12:00 |
03:52:04.62 |
-35:33:29.8 |
HIP 17922 |
27.74 |
| 2026-07-31 00:00 |
03:52:05.76 |
-35:33:57.6 |
HIP 17922 |
28.11 |
| 2026-07-31 12:00 |
03:52:06.88 |
-35:34:25.6 |
HIP 17922 |
28.48 |
| 2026-08-01 00:00 |
03:52:07.97 |
-35:34:53.7 |
HIP 17922 |
28.84 |
| 2026-08-01 12:00 |
03:52:09.04 |
-35:35:22.0 |
HIP 17922 |
29.21 |
| 2026-08-02 00:00 |
03:52:10.08 |
-35:35:50.4 |
HIP 17922 |
29.58 |
| 2026-08-02 12:00 |
03:52:11.09 |
-35:36:18.9 |
HIP 17922 |
29.95 |
| 2026-08-03 00:00 |
03:52:12.08 |
-35:36:47.6 |
HIP 17922 |
30.32 |
| 2026-08-03 12:00 |
03:52:13.04 |
-35:37:16.5 |
HIP 17922 |
30.69 |
| 2026-08-04 00:00 |
03:52:13.98 |
-35:37:45.4 |
HIP 17922 |
31.06 |
| 2026-08-04 12:00 |
03:52:14.89 |
-35:38:14.6 |
HIP 17922 |
31.43 |
| 2026-08-05 00:00 |
03:52:15.78 |
-35:38:43.8 |
HIP 18305 |
31.30 |
| 2026-08-05 12:00 |
03:52:16.64 |
-35:39:13.2 |
HIP 18305 |
31.07 |
| 2026-08-06 00:00 |
03:52:17.47 |
-35:39:42.7 |
HIP 18305 |
30.86 |
| 2026-08-06 12:00 |
03:52:18.28 |
-35:40:12.4 |
HIP 18305 |
30.66 |
| 2026-08-07 00:00 |
03:52:19.06 |
-35:40:42.2 |
HIP 18305 |
30.47 |
| 2026-08-07 12:00 |
03:52:19.81 |
-35:41:12.1 |
HIP 18305 |
30.30 |
| 2026-08-08 00:00 |
03:52:20.54 |
-35:41:42.1 |
HIP 18305 |
30.13 |
| 2026-08-08 12:00 |
03:52:21.24 |
-35:42:12.3 |
HIP 18305 |
29.99 |
| 2026-08-09 00:00 |
03:52:21.91 |
-35:42:42.5 |
HIP 18305 |
29.85 |
| 2026-08-09 12:00 |
03:52:22.55 |
-35:43:12.9 |
HIP 18305 |
29.73 |
| 2026-08-10 00:00 |
03:52:23.17 |
-35:43:43.4 |
HIP 18305 |
29.63 |
| 2026-08-10 12:00 |
03:52:23.76 |
-35:44:14.0 |
HIP 18305 |
29.54 |
| 2026-08-11 00:00 |
03:52:24.33 |
-35:44:44.8 |
HIP 18305 |
29.46 |
| 2026-08-11 12:00 |
03:52:24.87 |
-35:45:15.6 |
HIP 18305 |
29.40 |
| 2026-08-12 00:00 |
03:52:25.37 |
-35:45:46.6 |
HIP 18305 |
29.35 |
| 2026-08-12 12:00 |
03:52:25.86 |
-35:46:17.6 |
HIP 18305 |
29.32 |
| 2026-08-13 00:00 |
03:52:26.31 |
-35:46:48.7 |
HIP 18305 |
29.30 |
| 2026-08-13 12:00 |
03:52:26.74 |
-35:47:20.0 |
HIP 18305 |
29.30 |
| 2026-08-14 00:00 |
03:52:27.14 |
-35:47:51.3 |
HIP 18305 |
29.32 |
| 2026-08-14 12:00 |
03:52:27.51 |
-35:48:22.8 |
HIP 18305 |
29.35 |
| 2026-08-15 00:00 |
03:52:27.85 |
-35:48:54.3 |
HIP 18305 |
29.39 |
| 2026-08-15 12:00 |
03:52:28.17 |
-35:49:25.9 |
HIP 18305 |
29.45 |
| 2026-08-16 00:00 |
03:52:28.45 |
-35:49:57.6 |
HIP 18305 |
29.53 |
| 2026-08-16 12:00 |
03:52:28.71 |
-35:50:29.4 |
HIP 18305 |
29.62 |
| 2026-08-17 00:00 |
03:52:28.94 |
-35:51:01.2 |
HIP 18305 |
29.73 |
| 2026-08-17 12:00 |
03:52:29.15 |
-35:51:33.2 |
HIP 18305 |
29.85 |
| 2026-08-18 00:00 |
03:52:29.32 |
-35:52:05.2 |
HIP 18305 |
29.99 |
| 2026-08-18 12:00 |
03:52:29.47 |
-35:52:37.3 |
HIP 18305 |
30.14 |
| 2026-08-19 00:00 |
03:52:29.59 |
-35:53:09.4 |
HIP 18305 |
30.30 |